Locking device for speedometers for vehicles



20, 9 PQA. KOURTZMAN 7, 90

LOCKING DEVICE FOR SPEEDOMETERS FOR VEHICLES 2 Sheets-Sheet 1 Original Filed Jan. -31, 1929 j nvQnl'or Fer 14/1 0110: flour/z M44 Oct. 20, 1931.

P; A. KOURTZMAN LOCKING DEVICE FOR SPEEDOMETERS FOR VEHICLES Original Filed Jan. 31. 1929 2 Sheets-Sheet 2 ATTORNEYS ing device.

Patented Oct. g V

PAT 5 PER ANDERSSON KOURTZMAN," on, VARTAN, SWEDEN LOCKING nEvIcE Foe s rnnnoiirn'rnnsron VEHICLES Original application filed. January 31, 1929, Serial 110,336,364, and iii Sweden February '8, and this application filed. April 1,1930. SeriaI' No 440,531.

The present invention relates to a locking device for speedometers for vehicles, which speedometers have a shaft which can be connected by means of a clutch member to a driv- The characteristics of the invention consist'in the fact that associated with said shaft there is a groove for a bolt slidable in a stationary part of the apparatus, .which bolt, when the apparatus is disconnected:

from its driving device, through the action of a spring is kept in the groove and locks the shaft, but which by the clutch member is forced out of engagement with the groove, thus leaving the shaft free to rotate. V This application is a division of applicants co-pending application, serial No. 336,364, filed January 31st, 1929. t t

In the accompanying drawings there is shown, by way of example only, a locking device applied to a speedometer having a diagram cylinder provided with a diagram cord. Fig. 1 shows the apparatus in elevation. Fig. 2 shows the same in vertical section; and Fig. 3 is an enlarged sectional view showing a detail of the locking device.

Referring to the. drawings, 1, 2 is the diagram cylinder, which rotates on rollers 5 journalled in a stationary disc 6 supporting bearings 7 for rollers 8, which rest against the inner corner of a ring 4 fixed tothe cylinder. The rotary motion of the cylinder 1, 2 is transmitted from the running wheels of the vehicle by means of a flexible shaft, a portion of which is indicated at 72, said flexible shaft being connected up to a shaft 9, from which motion is imparted through the agency of gears '10, 10 10 10,10 10 ,10 and-a cogged ring 11, to the cylinder. The diagram cord is designated 12 and is kept lightly pressed between the cylinder 1, 2 and aifixed, transparent wall 13. The reference characters 21, 23, 24, 25, 26, 27, 28, 29 designate a centrifugal device which is fully described in my allowed application, serial No. 440,829, and which device serves to operate cables 19, one end of each of which is secured to a stationary bracket 22, the cables running thence over rollers 20 and being secured at their opposite ends to pulleys 18. The pulleys 18 are attached to a running wheel 17 on which lies '15, the other end of which lies on, and is attached to, a spring-drumBO; .Theband 15-is pulled in one direction by the centrifugal device and in the opposite direction by the} 192s. Divided 1 nd o which is attached' one end or gram. A gear 36 transmits rotary motion tothe centrifugal device from' the shaft 9.. AnJordinary jaw-clutch 52 (only indicated" in Fig. 2) enables the apparatus to standistil l on backing. is a cogged ring, from which:

motion is transmitted to a'counting mecha- A nism- (not shown). An'opening. 71' is provided in the housing of 'theapparatju's through which a signaling device may. be ob}.

served, as described in myco-pending allowed application serial No; 440,830. 1

- The device for automatically lockingthe apparatus when it is disconnected from the driving shaft on the vehicle comprises a bolt 64 housed in a spacing sleeve 69 which encircles the shaft 9, said bolt being mounted forJsliding movement in' parallel relation to theshaft. The bolt isprovidedwith a laterally extending enlargement 64 'and is normally under the pressure of a coil spring 67 which urges the bolt forward and causessaid enlargement to entera groove or recess 65 in the periphery of a collar 9 forme'd on the shaft 9. With the boltthus engaging the I collar it will beevident that the shaft 9 will However, the end 66 of the bolt pro ects outside of the be locked against rotation.

apparatus andiinto-the pathof a swivelfed [connecting member '73 carried by aflexible shaft 72 and which connecting member isin- 'teriorl'y threaded for engagement with-the "threaded lower end ofthe sleeve 69'thereby to retain the fiexibleshaft 7 2 in operative enr gagement withtshaft 9. In Fig. 2thebolt-is shown in its lowermost position thus locking the shaft 9 against rotation, and the connecting member 73-is out of contact with'the' end 66 of the bolt :With. the parts in this position'it will readily be seen that upon further screwing up the connecting member 7 3 on the sleeve 69, thesaid connecting member will engage the endlof the bolt and cause it to 2f; V V 1,82%996 move upward against the tension of the Y spring 67, thus carrying the enlarged portion suitable position and then locked by means of videdonly the characteristics of the invenof the bolt outofengagement with the groove 65 in the collar 9 and leaving the shaft 9 free to rotate with the flexible shaft 72.

The apparatusjis journalled on-a base plate" 68, which can be fixed to some suitable place, and has a sleeve-shaped part69 projecting through the plate 68, and also a nut 70 screwed upon part 69 under the base plate,

so that theapparatus can be turned into any the nut O in this position.

Theseparate parts of the apparatus shown" may of coursebe varied in many ways, prober encircling said'shaft and having an ex- 3 teriorly threaded sleeve portion forming a tion normally in engagement with said icouplingconnection for the shaft, a springflpressed bolt slidable axially in said tubular member and having an offset portion 'normally'in engagement with saidgroove thereby to retain the shaft against rotation, the

threaded portion of'said sleeve having an axially extending groove for thereception of one end of theabolt when in shaft-retaining position, anda coupling member threaded on said sleeve connection and adapted .to move said bolt against the tension of its spring thereby to carry said ofiset portionout of engagement with the collar groove; 7

2. In a speedometer, the combination of a stationary supporting plate, a tubular member mounted in said plate for angular movement relatively thereto, means for securing 'saidmember against movement, a shaft rotatable in the tubular member, and provided 7 with a collar having an axially extending pe- V, .ripherallyopen groove, said tubular member .havingan exteriorly threaded sleeve portion forming a coupling connection for the shaft,

a spring pressed bolt slidable axially in said tubular member and having an offset porlgroove thereby to retain. the shaft against rotation, and a, companion coupling is threaded on said sleeve and adapted to move the bolt against the tension of tits spring thereby to carry said offset portionout of enf ggagement with the groove.

In testimony whereofl have signed my T a :name to this specification.

- PER ANDERSSON 

